Confluence Throws ERROR: 400 in Browser When Manually Uploading Add-Ons

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Platform Notice: Server and Data Center Only. This article only applies to Atlassian products on the server and data center platforms.


When uploading an Add-On through the Upload add-on link, the Uploading box does not update and the browser gets stuck waiting.


Using Ctrl+Shift+I and watching the network tab, the following URL appears with a 400 error


And this error appears in the server response detail (this can be also seen in a HAR file).

<h2>ERROR: 400</h2>

Nothing is shown in atlassian-confluence.log or catalina.out.



  • Confluence is running behind a reverse proxy


  • The reverse proxy is not allowing the upload of the file.


Set up a non-proxied <Connector /> in server.xml and use that for uploading the Add-On. You can review the documentation here


Last modified on Nov 2, 2018

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